Spray carburetor for internal-combustion engines



May 29, 1923. 1,457,134

B. ADLER SPRAY CARBURETOR FOR INTERNAL COMBUSTION ENGINES Filed Aug. 22,1922 Fig.1

z k T J Inventor- Patented May 29, 1923.-

BR NO Anna, on nnnsnn v, G R ANY- SPRAY cansunn'ron roaINTERNAIIROQMBUSTION ENGINES! Application filed. August 22, 1922.-Serial 110,583,552.

To all whom it may concern;

Be it known that I. BRUNO ADLER, a citizen of the German Republic,residing at Dresden, Germany, have invented certain new and usefulImprovements in Spray Carburetors for Internal-Combustion Engines,

of which the followingis a specification.

This invention has for'its object an improvement in spraying carburetorsin order to render the same capable, if desired, of automaticallydrawing the fuel from the .main reservoir.

By means of a channel which connects the passage which admits air to themain fuel nozzle and leads to the float chamber a vacuum is produced inthe float chamber which, however, is lower than that which exists in themain nozzle.

In order to make the carburetoravailable for use with either atmosphericor subatmospheric pressure in the float chamber, an adjustable tickleris provided.

One form of the invention is illustrated on the accompanying drawing inwhich:

Fig. 1 is a longitudinal section of the carburetor on the line 11 ofFig. 2,

' Fig. 2 is a section on the line 2-2 of Fig. 1.

The body of the carburetor, indicated at 32, forms the main air passage.At one side the body has an enlargement 30 in which a tapered opening 2is bored. In this tapered opening a plug 6 is fitted. A passage 1 isbored transversely through this enlargement, the inner end of thispassage terminating adjacent the edge of the throttle valve when thelatter is closed. This passage supplies fuel for idling and its outerend is closed by the plug 31. r

A passage 3 is bored through both Walls of the main air passage, itsinner end entering the bore 2. In this passage is inserted a main nozzle5, the orifice of which discharges in the main air passage, in the re:stricted portion of the venturi 4 inserted therein. The plug 6 is boredlongitudinally as at 11 and has transverse openings 8 and 12 bored atits lower and upper ends respectively. In the lower end of the bore 11is inserted a calibrated plug 7 which forms the main fuel orifice. Inthe bore 12 is inserted a second calibrated plug 10 which determines thefuel feed item. The passage 8 connects the bore 11 and the main nozzle5'.

As shown on the drawing the plug 6 does not conipletely fill the bore 2and a serie's of small openings 9 connects the bore 11; with the"passage thus formed. Above the normal fuel. level, a passage 15 opensinto this unfilled space, the purpose of which'wfllbe describedsubsequently; A float chamber 13 containing the float l et surrounds thecar buretor body The float 14 controls 'theadmission of fuel to the"float chamber fin any desired manner, the normal fuel level beingindicated by the line LL.

The passage 15 communicates with the float chamber through a calibratedopening 16 and with the atmosphere by means of a calibrated opening 17.Above the opening 16 is placed a reducing valve18 in the form of a.disc, the lift of which is limited bv the snap ring 19 and i theweight'of which determines the vacuum which may be imposed on thefloatchamben When it is desired to use atmospheric pressure in the floatchamber the calibrated plug 16 is replaced by a solid plug.

Behind the carburetor I employ a tickler 22 this tickleroperates in aguide 20 and is maintained in raised position by a spring 21.

the tickler is formed a valve 26. If itbe desired to use atmosphericpressure in'the carburetor the pin is turned into-the slot 241 so thatthe valve 26 is held open in the raised position of the tickler. For useas'a lifting carburetor the pin is turnedinto the slot 25 so thatsthevalve is allowed to seat when the tickler is raised.

The movement of the tickler is deter-1 v mined by a pin'23 whichoperates. in slots 2 1 and 25 in the guide 20. On the stem of Theoperation of the device will be 0b- 1 vious from the foregoingdescription of the structure. At small throttle openings fuel is drawntothe orifice of theplug 7 and the orifice of the plug 10, mixed withthe an coming from the passage 15 into the main air passage of thecarburetor. At high speed operation the fuel flow only through the plug7, mixes with air coming through the 10, 16 and 17, proper mixture forthe va--s v rious operating conditions of the associated I engine may beobtained. As is well known .in carburetors of this type, the flow of airthrough the passage 15 and the opening 9 serves to prevent the undueenrichment at high engine speeds.

The depression Which causes the air flow through the passage 15 liftsthe valve 18 and is communicated to the interior 01 the float chamber.The difi'erential between this pressure and'the atmospheric pressure onthe fuel in the main reservoir serves to feed fuel to the float chamberwhenever the valve is opened by the fall of the float.

If the fuel is to be supplied to the carburetor by gravity or otherpressure, the

tickler will be turned so that the pin operates in the slot 24 and theopening at 16 Will be closed by a solid plug. Under these conditionsatmospheric pressure is maintained in the float chamber.

Having thus described my invention, I claim:

In combination With a carburetor having a float chamber and a mixturepassage, a conduit connecting said mixture passage and float chamber, anair inlet orifice in said conduit and a tickler having a valve on itsstem and means for normally holding said tickler raised and alternativemeans for fixing the raised position of the tickler so that in oneraised position the valve is held open and in the other the valve isclosed.

In testimony whereof I aflix my signature in presence of tWo Witnesses.

BRUNO ADLER. Witnesses:

FRANZ ScHoLzY, RUDOLPH FRIOKE.

